linux-kernel - Re: [RESEND PATCH v2] media: mtk-jpeg: Fix use after free bug due to uncanceled work

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Message-ID: <03449762-33b9-3e86-c65f-4bb9e0e917c6@collabora.com>
Date:   Thu, 20 Jul 2023 09:45:05 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Zheng Wang <zyytlz.wz@....com>, Kyrie.Wu@...iatek.com
Cc:     bin.liu@...iatek.com, mchehab@...nel.org, matthias.bgg@...il.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Irui.Wang@...iatek.com,
        security@...nel.org, hackerzheng666@...il.com,
        1395428693sheep@...il.com, alex000young@...il.com
Subject: Re: [RESEND PATCH v2] media: mtk-jpeg: Fix use after free bug due to
 uncanceled work

Il 07/07/23 11:24, Zheng Wang ha scritto:
> In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with
> mtk_jpeg_job_timeout_work. Then mtk_jpeg_dec_device_run
> and mtk_jpeg_enc_device_run may be called to start the
> work.
> If we remove the module which will call mtk_jpeg_remove
> to make cleanup, there may be a unfinished work. The
> possible sequence is as follows, which will cause a
> typical UAF bug.
> 
> Fix it by canceling the work before cleanup in the mtk_jpeg_remove
> 
> CPU0                  CPU1
> 
>                      |mtk_jpeg_job_timeout_work
> mtk_jpeg_remove     |
>    v4l2_m2m_release  |
>      kfree(m2m_dev); |
>                      |
>                      | v4l2_m2m_get_curr_priv
>                      |   m2m_dev->curr_ctx //use
> Fixes: b2f0d2724ba4 ("[media] vcodec: mediatek: Add Mediatek JPEG Decoder Driver")
> Signed-off-by: Zheng Wang <zyytlz.wz@....com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>